On Saturday, 9 November 2019 16:46:37 UTC, Lee Nowell wrote:
Hi All,

I have some 12v spotlights in my bathroom. I needed to move one so disconnected it some time ago and have eventually cut the new hole today. Having now forgotten which way it was wired I thought I should check with a multi meter to be on the safe side. It is 3 core and earth and the results (all AC) are as follows

With switch off
Grey - brown 146v
Grey - black 240v
Brown - black 76v

With switch on
Grey - brown 240v
Grey - black 240v
Brown - black 0v

So for this I conclude that
Grey is neutral
black is perm live
Brown is switched live

Is this correct ? More worryingly any idea why I am getting spurious voltages when the switch is off?

Thanks in advance

Lee.

Looks right. Cable capacitance plus a modern high impedance meter - use an old lower R one and those stray Vs will fall away. No earth conductor though?


NT